Questions & Answers about Hablé con ese muchacho.
Hablé is the first-person singular form of hablar in the pretérito indefinido (the simple past in Spain-style terminology).
So hablé means I spoke or I talked.
In this sentence, Hablé con ese muchacho, the subject is understood as I, because Spanish often leaves subject pronouns out when the verb already makes the person clear.
The accent mark in hablé is important because it shows both pronunciation and meaning.
- hablé = I spoke / I talked
- hable = that I speak / speak! (subjunctive or formal command, depending on context)
The written accent helps distinguish these forms.
It also shows that the stress falls on the last syllable: ha-BLÉ.